Fig. 3: Scope of 1,4-dihydropyridines for photoredox- and diruthenium-catalyzed enantioselective propargylic alkylation.

a Propargylic alkylated products with isolated yield. b 4-Alkyl-1,4-dihydropyridines with the formation of trace amounts of the desired products detected by GC-MS but not isolable for the reactions of 3a with 4.